Metal plate coated with lubricating resin and drilling processing method of printed wiring board use thereof utility

ABSTRACT

A metal plate coated with a lubricating resin is coated with a lubricating resin having a modified polyamide ({circle over (1)}) and a crosslinking curing agent ({circle over (2)}) of the modified polyamide ({circle over (1)}) on at least one side face of the metal plate. At this time, the compounding ratio of the modified polyamide ({circle over (1)}) and the above-described crosslinking curing agent ({circle over (2)}) is preferably (60:40) to (15:85) by mass ratio converted to solid content. Furthermore, according to requirement, an inorganic powder filler ({circle over (3)}) may be added to the resin composition.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a metal plate coated with alubricating resin which is preferable as a patch board for protection inorder to efficiently carry out in the small hole drilling process of aprinted wiring board, and the drilling processing method of the printedwiring board.

[0003] 2. Description of the Related Art

[0004] When through holes are formed by a drill on a laminated printedwiring board in which a metal foil such as copper or the like islaminated on an insulator, a method of carrying out drilling processingby a drill by arranging a water-soluble lubricating immersion sheet onone side or both sides of the above-described laminated substrate andusing the sheet as a patch board is disclosed in U.S. Pat. No. 4,781,495and U.S. Pat. No. 4,929,370. The lubricating immersion sheet used in themethod of forming the through holes is obtained by immersing a mixtureof glycols such as diethylene glycol, dipropylene glycol, and the likewhich is a solid water-soluble lubricant, synthetic waxes such as afatty acid and the like and nonionic surfactants in a porous materialsuch as paper.

[0005] On the other hand, a method of drilling by a drill by using awater-soluble matrix polymer of a polyethylene glycol and apolypropylene glycol or a fatty acid ester derivative thereof alone, ora mixture thereof, and arranging a sheet in which the above-describedpolymer layer is formed, is disclosed (Japanese Patent ApplicationLaid-Open No.4-92488, No.4-92489, No.4-92490, No.4-92491, No.4-92492,No.4-92493, No.4-92494).

[0006] Furthermore, a method of using a polyvinyl pyrrolidone, a gumarabic, a poly(sodium acrylate), sodium alginate, a carboxymethylcellulose derivative, a polyether ester, a polyethylenepolypropyleneglycol tolylene diisocyanate copolymer, a mixture of a specifiedpolyalkylene oxide, a specified dicarboxylic acid compound and adiisocyanate compound, and a resin obtained by reacting a copolymerderived from a specified vinyl compound with a dibasic oxygen acid whichcontains a polyoxyethylene group as another water-soluble matrixpolymer, is disclosed (Japanese Patent Application Laid-OpenNo.5-169400, No.6-344297, No.8-197496, No.10-6298 and No.10-330777).

[0007] However, these methods had defects in that although there issurely an effect of prevention of heat caused by a drill and effects ofthe reduction of roughness of the inner wall of the drilled part of aprinted wiring board and the improvement of drill life-time, theimmersion in a porous sheet such as paper or the like is deficient, theadhesion property with an aluminum substrate is inferior, the coatingfilm itself is further apt to be sticky, the stickiness of coating filmsurface occurs easily under high humidity conditions such as summer, andtrouble in treatment as a product is generated. According to advancedstudies by the inventors of the present application, the above-mentionedproblems were considerably improved by addition of an inorganic powderfiller, but the problem of the absorption of moisture or the stickinessby wetting was an essentially inevitable problem by the prior art inwhich the main component of coating film is composed of a water-solubleresin.

[0008] Additionally, there has been a strong requirement to reduce costsof a printed wiring board under the demand of lowering cost in recentelectronic information instruments. Accordingly, there is a requirementto shorten the drilling processing time and increase the number ofsheets produced per hour, and it has been necessary to increase therotational speed of a drill bit, make the processing speed of drillinghigher, increase the number of a printed wiring boards which areprocessed at the same time, and extend the life time of a drill, etc.For these demands, it is required to design to make the quality thereofhigh, as the patch board for a protective board which is used in asevere condition of drilling processing so as to improve the precisionof drilling position and the smoothness of the inner surface of thehole.

SUMMARY OF THE INVENTION

[0009] The object of the present invention is to provide a metal platecoated with a lubricating resin being suitable as a patch board for aprotective board, wherein the effect of preventing heat generation atthe drill bit in drilling, the lubrication effect and the effect ofpreventing scattering of chips are high, and simultaneously thedischarge property of chips is excellent, the drilling processing can beefficiently carried out in high quality, and simultaneously stickinessis not found, in the drilling processing of a printed wiring board by adrill; and drilling processing method of the printed wiring board beingused thereof.

[0010] The metal plate coated with a lubricating resin according to thefirst aspect of the present invention comprises: a lubricating resincoating film obtained by coating and curing by heat a resin compositioncontaining a modified polyamide ({circle over (1)}) and a crosslinkingcuring agent ({circle over (2)}) of the modified polyamide ({circle over(1)}) on at least one side face of the metal plate.

[0011] In the metal plate coated with a lubricating resin, thecompounding ratio of the above-described modified polyamide ({circleover (1)}) and the above-described crosslinking curing agent ({circleover (2)}) is preferably {circle over (1)}:{circle over (2)}=(60:40) to(85:15) by a mass ratio converted to solid content. In this case, “amass ratio converted to solid content” means a ratio of mass of eachconstitutive unit without solvent.

[0012] Furthermore, the above-described resin composition preferablycontains an inorganic powder filler ({circle over (3)}).

[0013] Furthermore, the above-described resin coating film preferablycontains the resin composition which is composed of a water-solublelubricant ({circle over (4)}) which is composed of an ethylene oxideunit or an ethylene oxide unit and a propylene oxide unit, and apolycarboxylic acid compound ({circle over (5)}).

[0014] Further, the above-described polycarboxylic acid compound({circle over (5)}) is preferably a polymer compound containing acarboxyl group in a polymer chain, particularly a polyolefin-based resincontaining a carboxyl group.

[0015] The above-described resin composition preferably contains atleast one kind of modified olefin-based resin ({circle over (6)}).

[0016] The above-described resin composition is selected from a groupcomprising, for example, a hydrocarbon-based lubricant composed of aliquid paraffin, a paraffin wax, a micro wax, a low polymerizationdegree polyethylene, a chlorinated hydrocarbon or a fluorocarbon, afatty acid-based lubricant composed of a higher fatty acid or an oxyfatty acid, a fatty acid amide-based lubricant composed of a fatty acidamide or an alkylene fatty acid amide, an ester-based lubricant composedof a lower alcohol ester of a fatty acid, a polyhydric alcohol ester ofa fatty acid, a polyglycol ester of a fatty acid or a fatty alcoholester of a fatty acid, an alcohol-based lubricant composed of fattyalcohols, a metal soap-based lubricant composed of an alkaline metalsalt of a fatty acid having 12 to 18 carbon atoms, a natural wax-basedlubricant composed of a carnauba wax, a candelilla wax, a bees wax, anibota wax or a montan wax, and a mixture thereof, and contains at leastone kind of lubricating compound ({circle over (7)}) having a meltingpoint of a range of 50 to 150° C.

[0017] The metal plate coated with a lubricating resin according to thesecond invention of the present application comprises: a lubricatingresin coating film obtained by coating the resin composition which iscomposed of a water-soluble lubricant ({circle over (4)}) which iscomposed of an ethylene oxide unit or an ethylene oxide unit and apropylene oxide unit, and a polycarboxylic acid compound ({circle over(5)}), on at least one side face of a metal plate.

[0018] In the metal plate coated with a lubricating resin, theabove-described resin composition preferably contains an inorganicpowder filler ({circle over (3)}).

[0019] Further, the above-described resin composition preferablycontains at least one kind of modified olefin-based resin ({circle over(6)}).

[0020] The above-described resin composition is selected from a groupcomprising, for example, a hydrocarbon-based lubricant composed of aliquid paraffin, a paraffin wax, a micro wax, a low polymerizationdegree polyethylene, a chlorinated hydrocarbon or a fluorocarbon, afatty acid-based lubricant composed of a higher fatty acid or an oxyfatty acid, a fatty acid amide-based lubricant composed of a fatty acidamide or an alkylene fatty acid amide, an ester-based lubricant composedof a lower alcohol ester of a fatty acid, a polyhydric alcohol ester ofa fatty acid, a polyglycol ester of a fatty acid or a fatty alcoholester of a fatty acid, an alcohol-based lubricant composed of fattyalcohols, a metal soap-based lubricant composed of an alkaline metalsalt of a fatty acid having 12 to 18 carbon atoms, a natural wax-basedlubricant composed of a carnauba wax, a candelilla wax, a bees wax, anibota wax or a montan wax, and a mixture thereof, and preferablycontains at least one kind of lubricating compound ({circle over (7)})having a melting point of a range of 50 to 150° C.

[0021] The lubricating resin coating film preferably haswater-resistance.

[0022] The above-described inorganic powder filler ({circle over (3)})shows swelling property to water, is a complex oxide derived fromlaminar mineral of silicate, and preferably has a crystal structurecontaining at least silicon, magnesium, fluorine, lithium, and sodium.

[0023] It is preferable that the above-described water-soluble lubricant({circle over (4)}) which is composed of an ethylene oxide unit or anethylene oxide unit and a propylene oxide unit is a polyethylene glycol,and the above-described polycarboxylic acid compound ({circle over (5)})is a polyolefin-based resin containing a carboxyl group.

[0024] In the present invention, it is preferable that a mold releasingresin composed of a resin composition containing an epoxy-based resinand a silicone-based resin is coated on a face of the above-describedmetal plate on which the above-described lubricating resin coating filmis not coated.

[0025] Furthermore, the above-described metal plate is an aluminum alloyplate, and the above-described lubricating resin coating film having athickness of 5 to 100 μm is preferably formed on at least one facethereof. In this case, the thickness of the above-described aluminumalloy plate is 20 to 400 μm.

[0026] The metal plate coated with a lubricating resin of the presentinvention is used as, for example, a patch board for protection arrangedat the proceeding side of a drill of a plurality of printed wiringboards laminated when the small diameter drilling processing is carriedout.

[0027] The drilling processing method of a printed wiring boardaccording to the present invention comprises the steps of: arranging themetal plate coated with a lubricating resin according to any one ofclaims 1 to 19 on a face of one or a plurality of printed wiring boardspiled to which a drill proceeds, as a patch board for protection; andcarrying out drilling by a drill.

DESCRIPTION OF THE PREFERRED EMBODIMENT

[0028] The present invention is described in detail below. The metalplate coated with a lubricating resin which is applied to the firstdrilling processing for a printed wiring board of the present inventionis a metal plate in which at least one side face of its surface iscoated with a resin composition composed of a mixture in which amodified water-soluble polyamide ({circle over (1)}) and a crosslinkingcuring agent ({circle over (2)}) of the modified polyamide ({circle over(1)}) are the essential components.

[0029] In the above-described resin composition, a thermoplastic resincomposition composed of a mixture in which the above-described inorganicpowder filler ({circle over (3)}) and/or the water-soluble lubricant({circle over (4)}) which is composed of an ethylene oxide unit or anethylene oxide unit and a propylene oxide unit, and the polycarboxylicacid compound ({circle over (5)}) are the essential components, and/orthe above-described modified olefin-based resin ({circle over (6)})and/or the above-described lubricating compound ({circle over (7)}) maybe contained, according to requirement.

[0030] The metal plate coated with a lubricating resin which is appliedto the second drilling processing for a printed wiring board of thepresent invention is a metal plate in which at least one side face ofits surface is coated with a thermoplastic resin composition composed ofa mixture in which the water-soluble lubricant ({circle over (4)}) whichis composed of an ethylene oxide unit or an ethylene oxide unit and apropylene oxide unit, and the polycarboxylic acid compound ({circle over(5)}) are the essential components.

[0031] In the above-described thermoplastic resin composition, theabove-described inorganic powder filler ({circle over (3)}) and/or theabove-described modified olefin-based resin ({circle over (6)}) and/orthe above-described lubricating compound ({circle over (7)}) may becontained, according to requirement.

[0032] Furthermore, the preferable constitutional ratio shown by a massratio converted to solid content is;

[0033] {circle over (1)}:{circle over (2)}=(60:40) to (85:15)

[0034] {circle over (4)}:{circle over (5)}=(20:80) to (67:33)

[0035] ({circle over (1)}+{circle over (2)}+{circle over (4)}+{circleover (5)}):{circle over (3)}=(70:30) to (100:0)

[0036] ({circle over (1)}+{circle over (2)}+{circle over (3)}+{circleover (4)}+{circle over (5)}):{circle over (6)}=(50:50) to (100:0)

[0037] ({circle over (1)}+{circle over (2)}+{circle over (3)}+{circleover (4)}+{circle over (5)}+{circle over (6)}):{circle over (7)}=(50:50)to (100:0).

[0038] Furthermore, a leveling agent or a defoaming agent may be furthercompounded in the above-described lubricating resin composition, ifnecessary, in order to improve coating property to a metal plate.

[0039] Furthermore, the lubricating resin coating film formed by coatingthese resin compositions on a metal plate and curing them by heat iscured by the curing agent ({circle over (2)}), and since the etherbonding of the water-soluble lubricant ({circle over (4)}) which iscomposed of an ethylene oxide unit or an ethylene oxide unit and apropylene oxide unit, and the carboxylic group of the polycarboxylicacid compound ({circle over (5)}) form an aggregate caused by hydrogenbonding, it is characterized in that the water-soluble lubricant({circle over (4)}) which is composed of an ethylene oxide unit or anethylene oxide unit and a propylene oxide unit, and the polycarboxylicacid compound ({circle over (5)}) reveal thermoplasticity having amelting point at about 50 to 70° C., do not show solubility in water,and have water-resistance.

[0040] Furthermore, “having water-resistance” in the present inventionmeans that the dissolution of the coating film does not occur when thelubricating resin coating film is wetted by water. The coating method toa metal plate is not specifically limited, but a production method suchas a gravure coat method or a roll coat method is preferable from theviewpoint of productivity, and the metal plate coated with a lubricatingresin having a homogeneous coating thickness after heating and qualitywithout stickiness can be obtained by the method.

[0041] The above-described modified polyamide ({circle over (1)}) showssolubility in water, and Shore hardness HSD at room temperature ispreferably 20 to 40. When the Shore hardness HSD exceeds 40, thehardness of the lubricating resin coating film after heating becomes toohigh, and the positional precision deteriorates at the time of drillingprocessing, lubricity at the time of drilling is lowered in particular,therefore a minus effect is imparted from the view point of improvementof a drill life time. On the other hand, when the Shore hardness HSD isless than 20, the hardness and strength of the lubricating resin coatingfilm after heating are insufficient, and the coating film itself happensto be inferior. Accordingly, Shore hardness HSD is preferably 20 to 40.

[0042] As the above-described crosslinking curing agent ({circle over(2)}), a melamine-based resin such as methylated methylol melamine, aphenol based resin, and a block isocyanate resin and the like arepreferable. It is appropriate that the compounding ratio, {circle over(1)}:{circle over (2)}, of the modified polyamide ({circle over (1)})and the crosslinking curing agent ({circle over (2)}) is (60:40) to(85:15) by a mass ratio converted to solid content. When the additionratio of the crosslinking curing agent ({circle over (2)}) is less than15, the dissolution and swelling of a coating film at the time ofexposure to moisture is apt to occur. On the other hand, when theaddition ratio exceeds 40, the flexibility of the coating film is lostand the position precision of a hole at the time of drilling processingis lowered. Accordingly, the compounding ratio, {circle over(1)}:{circle over (2)}, is preferably (60:40) to (85:15) by a mass ratioconverted to solid content.

[0043] The above-described inorganic powder filler ({circle over (3)})is a complex oxide of laminar silicate whose crystal structure isconstituted using at least silicon and magnesium as main elements, andkaolinite or halloysite, pyrophilite, talc, montmorillonite, beidellite,saponite, hectorite, vermiculite, muscovite, phlogopite, tetra siliconmica, margarite, or crinanite or the like which naturally exists, ismentioned. In the present invention, metamorphic mica which isconstituted by a crystal structure in which silicon, magnesium,fluorine, and sodium are main elements is mentioned as those showing aremarkable effect in the lubricant resin coating film property and thedrilling processing property of the above-described lubricating resin.The metamorphic mica which has this crystal structure shows naturallythe swelling property to water, and can bestow excellent characteristicsbelow to the swelling resin and the lubricating resin coating filmformed after heating. Firstly, it can be homogeneously dispersed in thelubricating resin by being swelled by water, and the control of theoptimum viscosity of the resin composition which can be used forproduction by a gravure coat method or a roll coat method can be carriedout. Secondly, the lubricity of the coating film obtained by thecombination of the modified polyamide ({circle over (1)}) which ismainly contained in the above-described lubricating resin coating filmlowers the contact area of a drill at the time of drilling processing byforming a fine uneven structure on the surface of the coating film inaddition to the lubricity which the metamorphic mica being theabove-described inorganic particle has in nature, the lowering offriction is designed to be obtained, and the more lubricity can beimparted. Thirdly, since the above-described metamorphic mica itself hasfilm forming property, and a good coating film can be obtained at thetime of coating. In order to further express the above-described threemain effects, the mean particle diameter of the above-describedmetamorphic mica is preferably 1 to 10 μm, furthermore preferably 2 to 8μm, and most preferably 3 to 5 μm. When the mean particle diameter ofthe metamorphic mica is less than 1 μm, the uniformity of dispersion ina mixture of the lubricating resin comes to be lowered. On the otherhand, when it exceeds 10 μm, the formation of a fine uneven structure onthe surface of the coating film becomes difficult, the effect oflubrication is lowered, and precipitation happens to occur duringstorage of the mixture of the lubricating resin. Accordingly, the meanparticle diameter of the metamorphic mica is preferably 1 to 10 μm.

[0044] The above-described water-soluble lubricant ({circle over (4)})which is composed of an ethylene oxide unit or an ethylene oxide unitand a propylene oxide unit is an organic compound having an etherbonding in a molecule. Specifically, aqueous lubricants such aspolyethylene glycol, a copolymer of polyethylene glycol andpolypropylene glycol, polyoxyethylene alkyl ethers, polyoxyethylenesulfosuccinic acid sodium laurylate, fatty acid esters of polyethyleneglycol, fatty acid esters of polyoxyethylene sorbitan, fatty acid estersof polyoxyethylene sorbit, polyoxyethlene polyoxypropylene alkyl ether,polyester polyols or polyether polyols composed of ethylene oxide andpropylene oxide, are mentioned, and these alone or a combination thereofmay be used. Among these, polyethylene glycol is most preferable. Themolecular weight is preferably 750 to 400000, more preferably 3400 to150000, and most preferably 20000 to 40000. When the molecular weight ofthe water-soluble lubricant which is composed of an ethylene oxide unitor an ethylene oxide unit and a propylene oxide unit is less than 750,stickiness is apt to occur in the lubricating resin coating film afterheating. On the other hand, when the molecular weight of thewater-soluble lubricant exceeds 400000, the viscosity of the resincomposition becomes markedly high, the leveling property of a coatingfilm at the time of coating is lowered, and workability is lowered.Accordingly, the molecular weight of the water-soluble lubricantcomposed of an ethylene oxide unit or an ethylene oxide unit and apropylene oxide unit is preferably 750 to 400000.

[0045] The above-described polycarboxylic acid compound ({circle over(5)}) is a high polymer compound containing a carboxyl group in thepolymer chain, preferably a polyolefin-based resin containing a carboxylgroup, and an ethylene-acrylic acid copolymer, poly acrylic acid and thelike can be used. Regarding the water-soluble lubricant ({circle over(4)}) which is composed of an ethylene oxide unit or an ethylene oxideunit and a propylene oxide unit, and the polycarboxylic acid compound({circle over (5)}), since the ether bonding of the water-solublelubricant ({circle over (4)}) which is composed of an ethylene oxideunit or an ethylene oxide unit and a propylene oxide unit, and thecarboxylic group of the polycarboxylic acid compound ({circle over (5)})form an aggregate caused by hydrogen bonding, the water-solublelubricant ({circle over (4)}) which is composed of an ethylene oxideunit or an ethylene oxide unit and a propylene oxide unit, and thepolycarboxylic acid compound ({circle over (5)}) show thermoplasticityhaving a melting point at about 50 to 70° C., do not show solubility inwater, and have water-resistance. The above-described aggregate ismelted by the friction heat generated at the time of drilling processingby a drill, the melted resin carries out lubrication action at the timeof drilling processing, therefore it has a characteristic that theroughness of the inner wall of a hole formed by drilling processing isreduced.

[0046] It is appropriate that the compounding ratio, ({circle over(4)}:{circle over (5)}), of the water-soluble lubricant ({circle over(4)}) which is composed of an ethylene oxide unit or an ethylene oxideunit and a propylene oxide unit, and the polycarboxylic acid compound({circle over (5)}) which is high polymer compound containing a carboxylgroup in the molecule is (20:80) to (67:33) by a mass ratio converted tosolid content. When the compounding ratio of the water-soluble lubricant({circle over (4)}) is less than 20, the melting point of the aggregatebecomes 90° C. or more, it is hardly melted by the friction heatgenerated at the time of drilling processing by a drill, therefore thelubrication action caused by the melted resin can not be expected. Onthe other hand, when the above-described polycarboxylic acid compound({circle over (5)}) is less than 33, the bonding force of the aggregatecaused by hydrogen bonding is lowered and water-resistance is degraded,therefore stickiness is apt to occur on the coating film. Accordingly,the compounding ratio, ({circle over (4)}:{circle over (5)}), of theabove-described water-soluble lubricant ({circle over (4)}) and theabove-described polycarboxylic acid compound ({circle over (5)}) ispreferably (20:80) to (67:33) by a mass ratio converted to solidcontent.

[0047] In the above-described resin composition, the above-describedmodified olefin-based resin ({circle over (6)}) may be added in order toimprove the adhesion property of the coating film and the metal plate,and additionally, to improve the position precision of a hole at thetime of drilling processing. The modified olefin-based resin ({circleover (6)}) preferably has a Shore hardness HDS of 60 or less, and theadhesion property between the coating film and the metal plate can beimproved. As the modified olefin-based resin ({circle over (6)}), acrystalline olefin-based resin, a polyolefin-based resin, anethylene-ethyl acrylate copolymer, or an ethylene-vinyl acetatecopolymer and the like can be used. Furthermore, the modifiedolefin-based resin ({circle over (6)}) is preferably soluble inwater-based solvent, or in a form of water-based emulsion.

[0048] The preferable compounding ratio, ({circle over (1)}+{circle over(2)}+{circle over (3)}+{circle over (4)}+{circle over (5)}):{circle over(6)}, of the total of the above-described modified polyamide ({circleover (1)}), the above-described crosslinking curing agent ({circle over(2)}), the above-described inorganic powder filler ({circle over (3)}),the water-soluble lubricant ({circle over (4)}), and the polycarboxylicacid compound ({circle over (5)}), to the above-described modifiedolefin-based resin ({circle over (6)}) is (50:50) to (100:0) by a massratio converted to solid content. When the addition ratio of theabove-described modified olefin-based resin ({circle over (6)}) exceeds50, chips generated at the time of drilling processing are melted byheating, and tend to be adhered in through holes and on the substrate,therefore it causes trouble in discharge and elimination of the chips,or the chips adhere to the drill and it becomes an obstruction atgrounding again. Accordingly, it is desirable that the addition ratio ofthe above-described modified olefin-based resin ({circle over (6)}) is50 or less.

[0049] Furthermore, the above-described lubricating compound ({circleover (7)}) can be added in order to impart more lubricity to theabove-described lubricating resin composition. Specific examples of theabove-described lubricating compound ({circle over (7)}) include aliquid paraffin, a paraffin wax, a micro wax, a low polymerizationdegree polyethylene, a chlorinated hydrocarbon or a fluorocarbon, afatty acid-based lubricant composed of a higher fatty acid or an oxyfatty acid, a fatty acid amide-based lubricant composed of a fatty acidamide or an alkylene fatty acid amide, an ester-based lubricant composedof a lower alcohol ester of a fatty acid, a polyhydric alcohol ester ofa fatty acid, a polyglycol ester of a fatty acid or a fatty alcoholester of a fatty acid, an alcohol-based lubricant composed of fattyalcohols, a metal soap-based lubricant composed of an alkaline metalsalt of a fatty acid having 12 to 18 carbon atoms, a natural wax-basedlubricant composed of a carnauba wax, a candelilla wax, a bees wax, anibota wax or a montan wax, and a mixture thereof, and these alone or amixture thereof may be used. The above-described lubricating compound({circle over (7)}) expresses its function more by melting due to thefriction heat generated at the time of drilling processing by a drill,those having a melting point at a range of 50 to 150° C. and morepreferably 50 to 90° C. are suitable as a lubricant. When thelubricating compound ({circle over (7)}) having a melting point whichexceeds 90° C. is used, it is hardly melted by the friction heatgenerated at the time of drilling processing by a drill, therefore anaction as a solid lubricant can be expected, but the action caused bythe melted lubricant is hardly expected, and the effect is reduced byhalf. On the other hand, when the melting point is less than 50° C., itcauses stickiness of the coating film in summer and the like inparticular, therefore it is not preferable.

[0050] The preferable compounding ratio, ({circle over (1)}+{circle over(2)}+{circle over (3)}+{circle over (4)}+{circle over (5)}+{circle over(6)}):{circle over (7)}, of the total of the above-described modifiedpolyamide ({circle over (1)}), the above-described crosslinking curingagent ({circle over (2)}), the above-described inorganic powder filler({circle over (3)}), the water-soluble lubricant ({circle over (4)})which is composed of an ethylene oxide unit or an ethylene oxide unitand a propylene oxide unit, the polycarboxylic acid compound ({circleover (5)}), and the above-described modified olefin-based resin ({circleover (6)}), to the above-described lubricating compound ({circle over(7)}) is (50:50) to (100:0) by a mass ratio converted to solid content.When the addition ratio of the above-described lubricating compound({circle over (7)}) exceeds 50, chips generated at the time of drillingprocessing are melted by heating, and tend to be adhered in throughholes and on the substrate, therefore it causes trouble in discharge andelimination of the chips, or the chips adhere to the drill and itbecomes an obstruction at grounding again. Accordingly, it is desirablethat the addition ratio of the above-described lubricating compound({circle over (7)}) is 50 or less.

[0051] Furthermore, a leveling agent or a defoaming agent can beappropriately added for further imparting coating properties to themetal plate in the above-described lubricating resin composition, ifnecessary.

[0052] As a means of coating the lubricating resin composition of thepresent invention on the metal plate and forming a coating film, agravure coat method or a roll coat method is preferable from theviewpoint of productivity. The lubricating resin composition coated onthe metal plate by such a method is baked in a range of 140 to 250° C.and preferably 160 to 200° C. for 5 to 120 seconds and preferably 10 to60 seconds to be dried, and a coating film having a coating thickness of5 to 100 μm and preferably 10 to 50 μm is formed on the metal plate.When the heating cure temperature is less than 140, the proceeding ofthe crosslinking reaction o is markedly slow, when the heating curetemperature exceeds 250° C., the crystal structure of the metal platechanges and the strength is lowered when the metal plate is an aluminumsubstrate. Accordingly, the heating cure temperature is preferably 140to 250° C.

[0053] The preferable thickness of the lubricating resin coating film is5 to 100 μm. When the thickness of the coating film is less than 5 μm,lubrication property is not revealed, and when the coating filmexceeding 100 μm is formed, coating is difficult and productivity isremarkably lowered because the viscosity of the resin composition mustbe extremely increased by the above-mentioned two methods.

[0054] An aluminum substrate is preferably used as the metal plate.Specifically, there are pure aluminum-based substrate and aluminumalloys such as 3000-based and 5000-based alloy and the like, but thepure aluminum-based substrate is most preferable. The thickness of thealuminum substrate is preferably 20 to 400 μm, more preferably 50 to 250μm and most preferably 100 to 200 μm. When the thickness of the aluminumsubstrate is less than 20 μm, the handling property as a patch boardbecomes worse, and the positional precision of the hole of a drill atthe time of drilling processing is lowered. Furthermore, when thethickness of the aluminum substrate exceeds 400 μm, the productivity bythe above-mentioned two methods is limited, and it becomes inferior fromthe view point of economic property.

[0055] Furthermore, for the metal plate coated with a lubricating resin,a mold releasing resin composition comprising a resin compositioncontaining a silicone-based resin which is disclosed in Japanese PatentApplication Publication No.4-9 may be coated on the face on which thelubricating resin coating film is not carried out, with a thickness ofabout 0.5 to 10 μm and further preferably about 1 to 5 μm.

[0056] Furthermore, the ratio of the plate thickness T of the metalplate of the aluminum substrate and the like and the thickness tr of thelubricating resin coating film may be appropriately selected inaccordance with drilling conditions and the like, but in case oftr/T≦0.5, the strain of the metal plate caused by the stress of thelubricating resin coating film becomes minimal, and flatness isimproved, therefore an excellent effect of further improving theprecision of the drilling processing is obtained. Furthermore, it can bemade as an aluminum raw material by melting as it is without peeling thelubricating resin coating film from the metal plate of the aluminumsubstrate and the like, by setting tr/T≦0.5, and the disposal treatmentafter using it as the patch board for protection is unnecessary,therefore a preferable effect from the viewpoint of the environment isalso obtained.

[0057] Then, the drilling processing method of the printed wiring boardusing the metal plate coated with a lubricating resin of the presentinvention is illustrated. The drilling processing method of the printedwiring board of the present invention is carried out by piling up one ora plurality of the printed wiring boards and arranging the metal platecoated with a lubricating resin of the present invention on the face towhich a drill proceeds. The drilling processing method of the printedwiring board is carried out by performing the cutting processing of themetal plate coated with a lubricating resin by a drill and penetratingit.

[0058] When a thermoplastic component is contained in the lubricatingresin of the metal plate coated with a lubricating resin, friction heatgenerated from the drilling processing is absorbed by the melting of thelubricating resin, and simultaneously the melted lubricating resinadheres to the drill, and accompanies it in accordance with theproceeding of the drill, therefore the friction at the time of drillingprocessing is reduced. Thus, cracks can be prevented from occurring inglass fiber, phenol resin, epoxy resin, copper foil, or paper or thelike which is the main constitutional component of the printed wiringboards, and severe damage occurs, under the severe drilling processingconditions which have been recently required in particular. Therefore,the abrasion of the drill is reduced, and simultaneously through hole inwhich the inner wall of hole after the drilling processing is smooth isobtained.

[0059] As described in detail above, according to the present invention,the metal plate coated with a lubricating resin film obtained by formingthe resin composition of the present invention on the metal platecomposed of aluminum and the like as a coating film has an excellenthole positional precision, inner wall roughness, stickiness of thecoating film, and water resistance, and can be adequately applied as apatch board at the time of drilling processing of the printed wiringboard. Furthermore, the coating film of the lubricating resincomposition of the present invention can be formed by a gravure coatmethod or a roll coat method which is advantageous from the point ofproductivity, and furthermore, since the coating film formed by heatingin a short time is not substantially soluble in water, stickiness doesnot occur even if it is exposed under high humidity conditions, and evenwhen the coating film once formed on a metal plate is wound up in theform of a roll, then loaded, and unwounded again from the roll, thetranscription of the coating film and stable performance can be retainedover a long period.

EXAMPLES

[0060] The effects of Examples of the present invention are illustratedbelow in comparison with Comparative Examples which deviate from thescope of the present invention.

Example 1

[0061] 16.0% By mass of water soluble modified polyamide, 4.0% by massof a blocked isocyanate-based as a crosslinking cure agent, 3.2% by massof a water swelling metamorphic mica as an inorganic powder filler, and0.3% by mass of a fluorine-based leveling were dispersed at about 40° C.with distilled water to uniformity to be dissolved. The lubricatingresin composition was coated on one face of a pure aluminum-based(1050-H18) sheet having a thickness of 150 μm by a roll coat method,cured by heating at 180° C. for 30 seconds, and a lubricating resincoating film with about 25 μm was formed on the aluminum substrate.

Examples 2 to 61

[0062] Lubricating resin coating films of about 25 μm thickness wereformed on an aluminum substrate by preparing the lubricating resincompositions shown in Table 1 and Table 2 described below according toExample 1, and coating them on the aluminum substrate and carrying outcuring by heating.

Comparative Examples 62 to 76

[0063] Lubricating resin coating films of about 25 μm thickness wereformed on an aluminum substrate by preparing the lubricating resincompositions shown in Table 3 described below according to Example 1 to61, and coating them on the aluminum substrate and carrying out curingby heating. TABLE 1 (Compounding ratio of resin composition (unit: % bymass)) {circle over (4)} {circle over (5)} {circle over (2)} {circleover (3)} Water Carboxylic {circle over (7)} {circle over (1)} CuringInorganic soluble acid {circle over (6)} Lubricating Others No Polyamideagent filler lubricant compound Olefin compound Surfactant Example  1 A)16.0 B) 4.0 0 0 0 0 0 M) 0.3  2 A) 17.0 B) 3.0 0 0 0 0 0 M) 0.3  3 A)12.0 B) 8.0 0 0 0 0 0 M) 0.3  4 A) 16.0 B) 4.0 E) 3.2 0 0 0 0 M) 0.3  5A) 17.0 B) 3.0 E) 3.2 0 0 0 0 M) 0.3  6 A) 12.0 B) 8.0 E) 3.2 0 0 0 0 M)0.3  7 A) 12.0 C) 8.0 E) 3.2 0 0 0 0 0  8 A) 12.0 D) 8.Q E) 3.2 0 0 0 00  9 A) 12.0 B) 3.0 0 R) 5.0 F) 5.0 0 0 M) 0.3 10 A) 12.0 B) 3.0 E) 2.0R) 5.0 F) 5.0 0 0 M) 0.3 11 A) 12.0 B) 3.0 E) 2.0 R) 5.0 F) 10.0 0 0 M)0.3 12 A) 12.0 B) 3.0 E) 2.0 S) 3.0 F) 12.0 0 0 M) 0.3 13 A) 12.0 B) 3.0E) 2.0 R) 10.0 F) 5.0 0 0 M) 0.3 14 A) 12.0 B) 3.0 E) 2.0 T) 2.0 F) 2.00 0 M) 0.3 15 A) 8.0 B) 2.0 E) 1.5 R) 12.0 F) 12.0 0 0 0 16 A) 16.0 B)4.0 0 0 0 G) 4.0 0 M) 0.3 17 A) 12.0 B) 3.0 0 R) 5.0 F) 5.0 G) 5.0 0 M)0.3 18 A) 12.0 B) 3.0 E) 2.0 R) 4.0 F) 4.0 G) 8.0 0 M) 0.3 19 A) 8.0 B)2.0 E) l.5 R) 3.5 F) 3.5 G) 15.0 0 0 20 A) 12.0 B) 3.0 E) 3.2 0 0 F) 5.00 M) 0.3 21 A) 8.0 B) 2.0 E) 3.2 0 0 F) 13.0 0 M) 0.3 22 A) 9.6 B) 2.4E) 3.2 0 0 G) 8.0 0 M) 0.3 23 A) 9.6 B) 2.4 E) 3.2 0 0 H) 8.0 0 M) 0.324 A) 9.6 B) 2.4 E) 3.2 0 0 I) 8.0 0 M) 0.3 25 A) 12.8 B) 3.2 E) 3.2 0 0J) 4.0 0 M) 0.3 26 A) 9.6 B) 2.4 0 0 0 0 U) 3.0 M) 0.3 27 A) 9.6 B) 2.4E) 2.0 0 0 0 V) 10 M) 0.3 28 A) 9.6 B) 2.4 E) 2.0 0 0 0 V) 2.5 M) 0.3 29A) 9.6 B) 2.4 E) 2.0 R) 3.0 F) 4.0 G) 6.0 V) 2.0 M) 0.3 30 A) 9.6 B) 2.4E) 2.0 R) 3.0 F) 4.0 G) 6.0 W) 2.0 0

[0064] TABLE 2 (Compounding ratio of resin composition (unit: % bymass)) {circle over (4)} {circle over (5)} {circle over (2)} {circleover (3)} Water Carboxylic {circle over (7)} {circle over (1)} CuringInorganic soluble acid {circle over (6)} Lubricating Others No Polyamideagent filler lubricant compound Olefin compound Surfactant Example 31 A)9.6 B) 2.4 E) 2.0 R) 3.0 F) 3.0 G) 6.0 U) 4.0 0 32 A) 9.6 B) 2.4 E) 2.00 0 G) 6.0 W) 8.0 M) 0.3 33 A) 9.6 B) 2.4 E) 2.0 0 0 G) 6.0 X) 8.0 M)0.3 34 A) 8.0 B) 2.0 E) 1.5 R) 2.5 F) 2.5 G) 2.5 V) 10.0 0 35 0 0 0 R)12.0 F) 12.0 0 0 M) 0.3 36 0 0 0 R) 10.0 F) 15.0 0 0 M) 0.3 37 0 0 E)2.0 R) 10.0 F) 15.0 0 0 M) 0.3 38 0 0 E) 2.0 R) 10.0 F) 15.0 G) 3.0 0 M)0.3 39 0 0 E) 2.0 R) 1O.0 F) 15.0 G) 3.0 V) 5.0 M) 0.3 40 A) 12.0 B) 3.0E) 3.5 K) 8.0 0 F) 5.0 0 M) 0.3 41 A) 10.0 B) 2.5 E) 3.5 K) 13.0 0 F)4.0 0 M) 0.3 42 A) 12.0 B) 3.0 E) 3.5 L) 8.0 0 F) 5.0 0 0 43 A) 13.0 B)3.2 E) 3.5 K) 6.5 0 F) 5.0 0 M) 0.3 44 A) 8.0 B) 2.0 E) 4.5 0 0 0 0 M)0.3 45 A) 16.0 B) 4.0 E) 0.5 0 0 0 0 0 46 A) 16.0 B) 4.0 E) 3.5 L) 6.5 00 0 M) 0.3 47 A) 16.0 B) 4.0 E) 3.5 K) 10.0 0 0 0 M) 0.3 48 A) 16.0 B)2.0 E) 3.2 0 0 0 0 M) 0.3 49 A) 10.5 B) 9.5 E) 3.2 0 0 0 0 M) 0.3 50 N)16.0 B) 4.0 E) 3.2 0 0 0 0 M) 0.3 51 A) 8.0 B) 2.0 E) 3.0 0 0 F) 15.0 00 52 A) 16.0 B) 4.0 E) 0.25 0 0 0 0 0 53 A) 8.0 B) 2.0 E) 5.0 0 0 0 0 M)0.3 54 A) 16.0 B) 4.0 O) 3.2 0 0 0 0 M) 0.3 55 A) 12.8 B) 3.2 E) 3.5 K)18.0 0 F) 5.0 0 M) 0.3 56 A) 13.0 B) 3.2 E) 3.5 K) 6.5 0 F) 5.0 0 M) 0.357 A) 12.0 B) 3.0 0 R) 5.0 Y) 5.0 0 0 M) 0.3 58 A) 12.0 B) 3.0 E) 2.0 R)5.0 Y) 5.0 0 0 M) 0.3 59 A) 12.0 B) 3.0 E) 2.0 R) 5.0 Y) 10.0 0 0 M) 0.360 0 0 E) 1.5 S) 3.0 F) 15.0 0 0 M) 0.3 61 0 0 E) 2.0 R) 20.0 F) 4.0 0 0M) 0.3

[0065] TABLE 3 (Compounding ratio of resin composition (unit: % bymass)) {circle over (4)} {circle over (5)} {circle over (2)} {circleover (3)} Water Carboxylic {circle over (7)} {circle over (1)} CuringInorganic soluble acid {circle over (6)} Lubricating Others No Polyamideagent filler lubricant compound Olefin compound Surfactant Comparative62 A) 16.0 0 E) 3.2 0 0 0 0 M) 0.3 Example 63 A) 16.0 0 E) 3.2 0 0 F)5.0 0 M) 0.3 64 A) 16.0 0 E) 3.2 K) 5.0 0 0 0 0 65 A) 14.0 0 E) 3.0 K)5.0 0 F) 5.0 0 0 66 0 0 0 R) 20.0 0 0 0 M) 0.3 67 0 0 E) 3.0 R) 20.0 0 00 0 68 0 0 0 R) 10.0 0 0 0 M) 0.3 T) 4.0 69 A) 10.0 0 E) 3.0 R) 10.0 0 00 M) 0.3 70 0 B) 3.0 E) 3.2 0 0 0 0 P) 15.0 71 0 B) 3.0 E) 3.2 0 0 F)15.0 0 0 72 0 B) 3.0 E) 3.2 0 0 G) 15.0 0 0 73 0 B) 3.0 E) 3.2 0 0 0 0Q) 15.0 74 0 B) 3.0 E) 3.2 0 0 0 0 R) 15.0 75 0 0 0 0 F) 25.0 0 0 0 76 00 E) 3.0 0 F) 24.3 0 0 0

[0066] The names of the compounds used in Examples and ComparativeExamples (Tables 1 to 3) are shown below.

[0067] A) Modified polyamide (Water soluble Nylon resin: Shore hardnessHSD 33)

[0068] B) Crosslinking curing agent (Blocked isocyanate-crosslinkingagent)

[0069] C) Crosslinking curing agent (Phenol-based crosslinking agent)

[0070] D) Crosslinking curing agent (Methylol melamine-basedcrosslinking agent)

[0071] E) Inorganic powder filler (Water swelling synthesis mica:average particle size=1 to 5 μm)

[0072] F) Modified olefin-based resin; polycarboxylic acid compound(Ethylene-acrylic acid copolymer emulsion)

[0073] G) Modified olefin-based resin (Polyethylene-based resinemulsion)

[0074] H) Modified olefin-based resin (Crystalline polypropylene basedresin emulsion)

[0075] I) Modified olefin-based resin (Urethane modifiedpolyolefin-based resin emulsion)

[0076] J) Modified olefin-based resin (High crystallinepolyethylene-based resin emulsion)

[0077] K) Water soluble lubricant (Polyether polyol: molecularweight=3400)

[0078] L) Water soluble lubricant (Polyether polyol: molecularweight=750)

[0079] M) Leveling agent (Fluorine-based surfactant)

[0080] N) Modified polyamide (Water soluble nylon resin: Shore hardnessHSD=80)

[0081] O) Inorganic powder filler (Non water swelling synthesis mica:average particle size=1 to 5 μm)

[0082] P) Water soluble lubricant (polyvinyl alcohol: polymerizationdegree=500 to 600, saponification degree=88%)

[0083] Q) Water soluble lubricant (Carboxymethyl cellulose sodium salt:polymerization degree=200 to 400)

[0084] R) Water soluble lubricant (polyethylene glycol: averagemolecular weight=20000)

[0085] S) Water soluble lubricant (polyethylene glycol: averagemolecular weight=40000)

[0086] T) Water soluble lubricant (polyethylene glycol: averagemolecular weight=150000 to 400000)

[0087] U) Lubricating compound (stearic acid-based lubricant: meltingpoint=52° C.)

[0088] V) Lubricating compound (paraffin wax-based lubricant: meltingpoint=61° C.)

[0089] W) Lubricating compound (carnauba wax-based lubricant: meltingpoint=83° C.)

[0090] X) Lubricating compound (zinc stearate-based lubricant: meltingpoint=120° C.)

[0091] Y) Polycarboxylic acid compound (polyacrylic acid: polymerizationdegree=300 to 400)

[0092] The metal plate coated with a lubricating resin preparedaccording to conditions of Examples and Comparative Examples above wasused as a patch board at the time of drilling processing of the printedwiring board, and the performance was evaluated.

[0093] The evaluation methods of the performance are shown as describedbelow. Firstly, the drilling processing of the printed wiring board iscarried out according to the conditions described in 1) and 2) describedbelow, the performance was evaluated by the hole positional precisionand inner wall roughness, and the stickiness of the coating film andwater resistance which are described in 3 to 6. The results are shown inTables 4 to 6 described below.

[0094] 1) Conditions of drilling processing

Condition 1

[0095] Drill bit: diameter of 0.2 mm

[0096] Rotational speed: 100000 rpm

[0097] Feeding speed: 1.4 m/min.

[0098] Drill hit number: 3000 hit

Condition 2

[0099] Drill bit: diameter of 0.3 mm

[0100] Rotational speed: 150000 rpm

[0101] Feeding speed: 2.5 m/min.

[0102] Drill hit number: 3000 hit

[0103] 2) Arranging method at drilling processing

[0104] A copper foil-laminated printed wiring board having a thicknessof 0.2 mm was placed under the metal plate coated with a lubricatingresin by piling up 8 sheets of the board, and a back-up board composedof a Bakelite board having a thickness of 1.5 mm is arranged underthereof to be provided for the drilling processing.

[0105] 3) Judgment method of hole positional precision

[0106] The judgment of the hole positional precision was carried outconcerning the lowest board (8^(th) sheet) among the 8-piled printedwiring board after 3000 hits. In the lowest board, those in which thestandard deviation of error interval from the central part of holes isless than 12.5 μm were evaluated as ⊚, those in which it is less than 15μm were evaluated as ◯, those in which it is less than 17.5 μm wereevaluated as Δ, and those in which it is 17.5 μm or more were evaluatedas X.

[0107] 4) Judgment method of inner wall roughness

[0108] The judgment of the inner wall roughness was carried out bymeasuring the inner wall roughness of the left and right of therespective through hole by every two holes at, before and after 2000hits. Those in which the average value was less than 12.5 μm wereevaluated as ⊚, those in which it was less than 15 μm were evaluated as◯, those in which it was less than 17.5 μm were evaluated as Δ, andthose in which it exceeded 17.5 μm were evaluated as X.

[0109] 5) Judgment method of stickiness of coating film

[0110] On the metal plate coated with a lubricating resin which was cutinto a square having longitudinal and horizontal lengths of 5 cm, analuminum plate (having no coating film) having the same form was piledup so as to be in contact with the lubricating coating film, a load of50 kg was mounted on the piled plates, and it was stood alone underconditions of 40° C. and relative humidity of 90% for 12 hours. Those inwhich the transcription of the lubricating resin coating film was notconfirmed were evaluated as ◯, those in which the transcription occurredslightly were evaluated as Δ, and those in which the transcription ofthe lubricating coating film occurred clearly were evaluated as X.

[0111] 6) Judgment method of water resistance of coating film

[0112] Distilled water was sprayed on the metal plate coated with alubricating resin by a sprayer, and it was stood alone at roomtemperature for 5 minutes in a condition in which the lubricating resincoating film was wet with water. When the coating film was softly rubbedby a nail, those in which scratch and the like did not occur on thecoating film were evaluated as ⊚, those in which a visual change in thecoating film occurred slightly were evaluated as ◯, those in which thecoating film was dissolved slightly were evaluated as Δ, and those inwhich the coating film was dissolved completely and the texture of themetal was exposed were evaluated as X. TABLE 4 (Evaluation result ofExample) Water Hole Inner Stickiness resistance Evaluation positionalwall of of coating No. method Precision roughness coating film Example 1Condition 2 ◯ ◯ Δ ◯ 2 Condition 2 ◯ ◯ Δ Δ 3 Condition 2 Δ ◯ ◯ ◯ 4Condition 1 ◯ ◯ ◯ ⊚ 5 Condition 1 ⊚ ◯ ◯ ◯ 6 Condition 1 ◯ ◯ ◯ ⊚ 7Condition 1 ⊚ ◯ ◯ ⊚ 8 Condition 1 ⊚ ◯ ◯ ◯ 9 Condition 2 ◯ ⊚ ◯ ◯ 10Condition 2 ⊚ ⊚ ◯ ◯ 11 Condition 2 ◯ ⊚ ◯ ⊚ 12 Condition 2 ◯ ◯ ◯ ⊚ 13Condition 2 ◯ ⊚ Δ ◯ 14 Condition 2 ◯ ◯ ◯ ◯ 15 Condition 2 ◯ ⊚ Δ Δ 16Condition 2 ◯ ◯ ◯ ◯ 17 Condition 2 ◯ ⊚ ◯ ◯ 18 Condition 2 ⊚ ⊚ ◯ ⊚ 19Condition 2 ◯ ◯ ◯ ⊚ 20 Condition 1 ⊚ ⊚ ◯ ⊚ 21 Condition 1 ⊚ ◯ ◯ ⊚ 22Condition 1 ⊚ ◯ ◯ ⊚ 23 Condition 1 ⊚ ◯ ◯ ⊚ 24 Condition 1 ◯ ◯ ◯ ⊚ 25Condition 1 ◯ ◯ ◯ ⊚ 26 Condition 2 ◯ ⊚ Δ ⊚ 27 Condition 2 ◯ ⊚ ◯ ⊚ 28Condition 2 ◯ ⊚ ◯ ⊚ 29 Condition 2 ◯ ⊚ ◯ ⊚ 30 Condition 2 ◯ ⊚ ◯ ⊚

[0113] TABLE 5 (Evaluation result of Example) Hole Inner StickinessWater Evaluation Positional wall of coating resistance No. methodPrecision roughness film of coating Example 31 Condition 2 ◯ ⊚ Δ ⊚ 32Condition 2 ◯ ⊚ ◯ ⊚ 33 Condition 2 ◯ ◯ ◯ ⊚ 34 Condition 2 ◯ ⊚ ◯ ⊚ 35Condition 2 ◯ ⊚ Δ Δ 36 Condition 2 ◯ ⊚ ◯ ◯ 37 Condition 2 ⊚ ⊚ ◯ ◯ 38Condition 2 ⊚ ⊚ ◯ ◯ 39 Condition 2 ⊚ ⊚ ◯ ◯ 40 Condition 1 ⊚ ⊚ ◯ ⊚ 41Condition 1 ⊚ ⊚ ◯ ◯ 42 Condition 1 ⊚ ⊚ ◯ ⊚ 43 Condition 1 ⊚ ⊚ ◯ ⊚ 44Condition 1 ◯ ◯ ◯ ◯ 45 Condition 1 ◯ ◯ ◯ ◯ 46 Condition 1 ◯ ⊚ ◯ ◯ 47Condition 1 ◯ ⊚ ◯ ◯ 48 Condition 1 ◯ ◯ ◯ Δ 49 Condition 1 Δ ◯ ◯ ⊚ 50Condition 1 Δ Δ ◯ ⊚ 51 Condition 1 ⊚ Δ ◯ ◯ 52 Condition 1 Δ ◯ Δ Δ 53Condition 1 Δ ◯ ◯ ◯ 54 Condition 1 Δ Δ ◯ ◯ 55 Condition 1 ⊚ ⊚ Δ ◯ 56Condition 1 ⊚ ⊚ ◯ ⊚ 57 Condition 2 Δ Δ Δ ◯ 58 Condition 2 Δ ◯ Δ ◯ 59Condition 2 Δ ◯ Δ ◯ 60 Condition 2 Δ ◯ ◯ ◯ 61 Condition 2 Δ ◯ ◯ ◯

[0114] TABLE 6 (Evaluation result of Comparative Example) Hole InnerWater Evaluation positional wall Stickiness resistance No. methodPrecision roughness of coating of coating Compara- tive Example 62Condition 1 ◯ ◯ ◯ X 63 Condition 1 ⊚ ◯ ◯ X 64 Condition 1 ◯ ⊚ ◯ X 65Condition 1 ⊚ ⊚ ◯ X 66 Condition 2 ◯ ◯ X X 67 Condition 2 ⊚ ⊚ X X 68Condition 2 ◯ ◯ X X 69 Condition 2 ⊚ ⊚ X X 70 Condition 1 X Δ ◯ ◯ 71Condition 1 X ◯ ◯ ◯ 72 Condition 1 X ◯ ◯ ◯ 73 Condition 1 X X ◯ Δ 74Condition 1 ◯ ◯ Δ X 75 Condition 2 X Δ Δ ◯ 76 Condition 2 X ◯ ◯ ◯

[0115] As shown in the above-mentioned Table 4 and Table 5, the effectof improving the marked improvement of performance was confirmed inExamples 1 to 61 included in the scope of the invention of the presentapplication, regarding the hole positional precision at the time ofdrilling processing by a drill, the inner wall roughness of throughholes, the transcription behavior caused by moisture absorption of thelubricating coating film which was formed on an aluminum substrate, andthe water resistance of the lubricating coating film.

[0116] The lubricating resin components of Examples 1 to 3 areconstituted by ({circle over (1)}) and ({circle over (2)}). These showedappropriate performance only when the drilling processing was carriedout under the condition 2.

[0117] The lubricating resin components of Examples 4 to 8 areconstituted by ({circle over (1)}), ({circle over (2)}) and ({circleover (3)}). Furthermore, the lubricating resin components of Examples 6to 8 are Examples in which the kind of the crosslinking curing agent({circle over (2)}) is changed. The lubricating resin component ofExample 9 is constituted by ({circle over (1)}), ({circle over (2)}),({circle over (4)}) and ({circle over (5)}). The lubricating resincomponents of Examples 10 to 15 are constituted by those in which({circle over (4)}) and ({circle over (5)}) are added to ({circle over(1)}), ({circle over (2)}) and ({circle over (3)}). The lubricatingresin component of Example 16 is constituted by ({circle over (1)}),({circle over (2)}) and ({circle over (6)}). The lubricating resincomponent of Example 17 is constituted by ({circle over (1)}), ({circleover (2)}), ({circle over (4)}), ({circle over (5)}) and ({circle over(6)}), the lubricating resin components of Examples 18 and 19 areconstituted by those in which ({circle over (6)}) is added to ({circleover (1)}), ({circle over (2)}), ({circle over (3)}), ({circle over(4)}) and ({circle over (5)}), and the lubricating resin components ofExamples 20 to 25 are constituted by those in which ({circle over (6)})is added to ({circle over (1)}), ({circle over (2)}) and ({circle over(3)}). The lubricating resin component of Examples 26 is constituted by({circle over (1)}), ({circle over (2)}) and ({circle over (7)}).

[0118] The lubricating resin components of Examples 27 and 28 areconstituted by ({circle over (1)}), ({circle over (2)}), ({circle over(3)}) and ({circle over (7)}). The lubricating resin components ofExamples 29 to 31 and Example 34 are constituted by ({circle over (1)}),({circle over (2)}), ({circle over (3)}), ({circle over (4)}), ({circleover (5)}), ({circle over (6)}) and ({circle over (7)}). The lubricatingresin components of Examples 32 and 33 are constituted by ({circle over(1)}), ({circle over (2)}), ({circle over (3)}), ({circle over (6)}) and({circle over (7)}). The lubricating resin components of Examples 35 and36 are constituted by ({circle over (4)}) and ({circle over (5)}). Thelubricating resin component of Example 37 is constituted by ({circleover (3)}), ({circle over (4)}) and ({circle over (5)}). The lubricatingresin component of Example 38 is constituted by those in which ({circleover (6)}) is added to ({circle over (3)}), ({circle over (4)}) and({circle over (5)}). The lubricating resin component of Example 39 isconstituted by those in which ({circle over (6)}) and ({circle over(7)}) are added to ({circle over (3)}), ({circle over (4)}) and ({circleover (5)}). The lubricating resin components of Examples 40 to 43 areconstituted by those in which ({circle over (4)}) and ({circle over(6)}) are added to ({circle over (1)}), ({circle over (2)}) and ({circleover (3)}). The lubricating resin component of Examples 44 and 45 areconstituted by ({circle over (1)}), ({circle over (2)}) and ({circleover (3)}). The lubricating resin components of Examples 46 and 47 areconstituted by those in which ({circle over (4)}) is added to ({circleover (1)}), ({circle over (2)}) and ({circle over (3)}).

[0119] Furthermore, (B) as the crosslinking curing agent ({circle over(2)}), (E) as the inorganic powder filler ({circle over (3)}), (F) asthe modified olefin-based resin ({circle over (6)}) and/or thepolycarboxylic acid compound ({circle over (5)}), and (K) and/or (S) asthe water-soluble lubricant ({circle over (4)}) are preferable.

[0120] The lubricating resin component of Example 48 is ({circle over(1)})+({circle over (2)})+({circle over (3)}), but since the compoundingratio of the crosslinking curing agent ({circle over (2)}) is less thanthe lower limit value of the preferable scope of the present invention,the coating film showed slight water solubility. The lubricating resincomponent of Example 49 is ({circle over (1)})+({circle over(2)})+({circle over (3)}), but since the compounding ratio of thecrosslinking curing agent ({circle over (2)}) exceeds the upper limitvalue of the preferable scope of the present invention, the holepositional precision at the time of drilling processing was slightlylowered. The lubricating resin component of Example 50 is ({circle over(1)})+({circle over (2)})+({circle over (3)}), and the compounding ratiois within the preferable scope of the present invention, but since ahard polyamide was used, the hole positional precision is slightlylowered. Furthermore, the inner wall roughness was also lowered. Thelubricating resin component of Example 51 is ({circle over(1)})+({circle over (2)})+({circle over (3)})+({circle over (6)}), butsince the compounding ratio of the polyolefin ({circle over (6)})exceeds the upper limit value of the preferable scope of the presentinvention, the removal property of chips was slightly lowered. Thelubricating resin component of Example 52 is ({circle over(1)})+({circle over (2)})+({circle over (3)}), but since the compoundingratio of the inorganic powder filler ({circle over (3)}) is negligiblysmall, the hole positional precision was slightly lowered when thedrilling processing was carried out at the condition 1. Furthermore, theinner wall roughness and the water resistance of the coating film wereslightly lowered. The lubricating resin component of Example 53 is({circle over (1)})+({circle over (2)})+({circle over (3)}), but sincethe compounding ratio of the inorganic powder filler ({circle over (3)})exceeds the upper limit value of the preferable scope of the presentinvention, the viscosity of the resin composition is raised, coating tothe metal plate becomes difficult, and the surface of the lubricatingresin coating film becomes slightly rough, therefore the hole positionalprecision is slightly lowered. The lubricating resin component ofExample 54 is ({circle over (1)})+({circle over (2)})+({circle over(3)}), but since the inorganic powder filler ({circle over (3)}) is amaterial not revealing the swelling property to water, the dispersion offiller is not good, the surface becomes slightly rough, therefore thehole positional precision and the inner wall roughness were slightlylowered. The lubricating resin component of Example 55 is ({circle over(1)})+({circle over (2)})+({circle over (3)})+({circle over(4)})+({circle over (6)}), but since the compounding ratio of thewater-soluble lubricant ({circle over (4)}) exceeds the upper limitvalue of the preferable scope of the present invention, stickinessoccurred slightly on the lubricating resin coating film. The lubricatingresin component of Example 56 forms a mold releasing resin coating filmon the opposite side of the face on which the lubricating resin coatingfilm according to Example 43 is formed, reveals the excellent holepositional precision, the inner wall roughness, and the waterresistance, and no stickiness occurred. The lubricating resin componentof Example 57 is ({circle over (1)})+({circle over (2)})+({circle over(4)})+({circle over (5)}) the lubricating resin components of Examples58 and 59 is ({circle over (1)})+({circle over (2)})+({circle over(3)})+({circle over (4)})+({circle over (5)}), but a poly(acrylic acid)is used for the polycarboxylic acid compound ({circle over (5)}).Accordingly, the excellent hole positional precision, the inner wallroughness, and the stickiness of the coating film are slightly loweredin Example 57. Furthermore, the coating film becomes slightly hard, andthe hole positional precision is slightly lowered in Examples 58 and 59.The lubricating resin component of Example 60 is ({circle over(3)})+({circle over (4)})+({circle over (5)}), but since the molecularweight of the water-soluble lubricant exceeds the upper limit value ofthe preferable scope of the present invention, the viscosity of theresin composition increases, it becomes difficult to coat it on themetal plate, and the surface of the lubricating resin coating filmbecomes slightly rough, therefore the hole positional precision isslightly lowered. The lubricating resin component of Example 61 is({circle over (3)})+({circle over (4)})+({circle over (5)}), but sincethe compounding ratio the water-soluble lubricant ({circle over (4)})exceeds the upper limit value of the preferable scope of the presentinvention, the water resistance and stickiness of the lubricating resincoating film are slightly lowered.

[0121] On the contrary, those satisfying all of a series of performancesdid not exist in Comparative Examples 62 to 76 described in theabove-mentioned Table 6 which were out of the scope of the invention ofthe present application. The lubricating resin components of ComparativeExamples 62 to 65 are ({circle over (1)})+({circle over (3)}), and sincethe curing agent ({circle over (2)}) is not contained, the waterresistance was deteriorated in particular. Since the lubricating resincomponents of Comparative Examples 66 to 69 contain only water-solublelubricant ({circle over (4)}) as a main component and the polycarboxylicacid compound ({circle over (5)}) is not contained, they arewater-soluble and degraded in stickiness and water resistance. Thelubricating resin components of Comparative Examples 70 to 74 are({circle over (2)})+({circle over (3)}), and since the polyamide({circle over (1)}), the water-soluble lubricant ({circle over (4)}),and the polycarboxylic acid compound ({circle over (5)}) are notcontained, the desired performances were not obtained. The holepositional precision was deteriorated in Comparative Example 71 andComparative Example 72, and the water resistance of the coating film wasslightly lowered and the hole positional precision and the inner wallroughness were deteriorated in Comparative Example 73. The stickiness ofthe coating film was slightly lowered and the water resistance of thecoating film was slightly lowered in Comparative Example 74. The coatingfilms of Comparative Examples 75 to 76 contain only polycarboxylic acidcompound ({circle over (5)}), as a main component, and the coating filmis hard and degraded in hole positional precision.

[0122] Accordingly, it was made clear that only the metal plate havingthe lubricating coating film of the compounding which was prescribed inthe technical scope of the invention of the present application revealsexcellent performances as the patch board at the time of drillingprocessing of the printed wiring board.

What is claimed is:
 1. A metal plate coated with a lubricating resincomprising: a lubricating resin coating film obtained by coating andcuring by heat a resin composition containing a modified polyamide({circle over (1)}) and a crosslinking curing agent ({circle over (2)})of the modified polyamide ({circle over (1)}) on at least one side faceof the metal plate.
 2. A metal plate coated with a lubricating resinaccording to claim 1, wherein the compounding ratio of said modifiedpolyamide ({circle over (1)}) and said crosslinking curing agent({circle over (2)}) is {circle over (1)}:{circle over (2)}=(60:40) to(85:15) by a mass ratio converted to solid content.
 3. A metal platecoated with a lubricating resin according to claim 1, wherein said resincomposition contains an inorganic powder filler ({circle over (3)}). 4.A metal plate coated with a lubricating resin according to claim 1,wherein said resin coating film contains the resin composition which iscomposed of a water-soluble lubricant ({circle over (4)}) which iscomposed of an ethylene oxide unit or an ethylene oxide unit and apropylene oxide unit, and a polycarboxylic acid compound ({circle over(5)}).
 5. A metal plate coated with a lubricating resin according toclaim 1, wherein said polycarboxylic acid compound ({circle over (5)})is a polymer having a carboxyl group in a polymer chain.
 6. A metalplate coated with a lubricating resin according to claim 5, wherein saidpolycarboxylic acid compound ({circle over (5)}) is a polyolefin-basedresin containing a carboxyl group.
 7. A metal plate coated with alubricating resin according to claim 1, wherein said resin compositioncontains at least one kind of modified olefin-based resin ({circle over(6)}).
 8. A metal plate coated with a lubricating resin according toclaim 1, wherein said resin composition is selected from a groupcomprising a hydrocarbon-based lubricant composed of a liquid paraffin,a paraffin wax, a micro wax, a low polymerization degree polyethylene, achlorinated hydrocarbon or a fluorocarbon, a fatty acid-based lubricantcomposed of a higher fatty acid or an oxy fatty acid, a fatty acidamide-based lubricant composed of a fatty acid amide or an alkylenefatty acid amide, an ester-based lubricant composed of a lower alcoholester of a fatty acid, a polyhydric alcohol ester of a fatty acid, apolyglycol ester of a fatty acid or a fatty alcohol ester of a fattyacid, an alcohol-based lubricant composed of fatty alcohols, a metalsoap-based lubricant composed of an alkaline metal salt of a fatty acidhaving 12 to 18 carbon atoms, a natural wax-based lubricant composed ofa carnauba wax, a candelilla wax, a bees wax, an ibota wax or a montanwax, and a mixture thereof, and contains at least one kind oflubricating compound ({circle over (7)}) having a melting point of arange of 50 to 150° C.
 9. A metal plate coated with a lubricating resincomprising: a lubricating resin coating film obtained by coating theresin composition which is composed of a water-soluble lubricant({circle over (4)}) which is composed of an ethylene oxide unit or anethylene oxide unit and a propylene oxide unit, and a polycarboxylicacid compound ({circle over (5)}), on at least one side face of a metalplate.
 10. A metal plate coated with a lubricating resin according toclaim 9, wherein said resin composition contains an inorganic powderfiller ({circle over (3)}).
 11. A metal plate coated with a lubricatingresin according to claim 9, wherein said resin composition contains atleast one kind of modified olefin-based resin ({circle over (6)}).
 12. Ametal plate coated with a lubricating resin according to claim 9,wherein said resin composition is selected from a group comprising ahydrocarbon-based lubricant composed of a liquid paraffin, a paraffinwax, a micro wax, a low polymerization degree polyethylene, achlorinated hydrocarbon or a fluorocarbon, a fatty acid-based lubricantcomposed of a higher fatty acid or an oxy fatty acid, a fatty acidamide-based lubricant composed of a fatty acid amide or an alkylenefatty acid amide, an ester-based lubricant composed of a lower alcoholester of a fatty acid, a polyhydric alcohol ester of a fatty acid, apolyglycol ester of a fatty acid or a fatty alcohol ester of a fattyacid, an alcohol-based lubricant composed of fatty alcohols, a metalsoap-based lubricant composed of an alkaline metal salt of a fatty acidhaving 12 to 18 carbon atoms, a natural wax-based lubricant composed ofa carnauba wax, a candelilla wax, a bees wax, an ibota wax or a montanwax, and a mixture thereof, and contains at least one kind oflubricating compound ({circle over (7)}) having a melting point of arange of 50 to 150° C.
 13. A metal plate coated with a lubricating resinaccording to claim 1, wherein the lubricating resin coating film haswater-resistance.
 14. A metal plate coated with a lubricating resinaccording to claim 9, wherein the lubricating resin coating film haswater-resistance.
 15. A metal plate coated with a lubricating resinaccording to claim 1, wherein said inorganic powder filler ({circle over(3)}) shows swelling property to water, is a complex oxide derived fromlaminar mineral of silicate, and has a crystal structure containing atleast silicon, magnesium, fluorine, lithium, and sodium.
 16. A metalplate coated with a lubricating resin according to claim 9, wherein saidinorganic powder filler ({circle over (3)}) shows swelling property towater, is a complex oxide derived from laminar mineral of silicate, andhas a crystal structure containing at least silicon, magnesium,fluorine, lithium, and sodium.
 17. A metal plate coated with alubricating resin according to claim 1, wherein said water-solublelubricant ({circle over (4)}) which is composed of an ethylene oxideunit or an ethylene oxide unit and a propylene oxide unit ispolyethylene glycol, and said polycarboxylic acid compound ({circle over(5)}) is a polyolefin-based resin containing a carboxyl group.
 18. Ametal plate coated with a lubricating resin according to claim 9,wherein said water-soluble lubricant ({circle over (4)}) which iscomposed of an ethylene oxide unit or an ethylene oxide unit and apropylene oxide unit is polyethylene glycol, and said polycarboxylicacid compound ({circle over (5)}) is a polyolefin-based resin containinga carboxyl group.
 19. A metal plate coated with a lubricating resinaccording to claim 1, wherein a mold releasing resin compositioncomposed of a resin composition containing an epoxy-based resin and asilicone-based resin is coated on a face of said metal plate on whichsaid lubricating resin coating film is not coated.
 20. A metal platecoated with a lubricating resin according to claim 9, wherein a moldreleasing resin composition composed of a resin composition containingan epoxy-based resin and a silicone-based resin is coated on a face ofsaid metal plate on which said lubricating resin coating film is notcoated.
 21. A metal plate coated with a lubricating resin according toclaim 1, wherein said metal plate is an aluminum alloy plate, and saidlubricating resin coating film having a thickness of 5 to 100 μm isformed on at least one side face thereof.
 22. A metal plate coated witha lubricating resin according to claim 9, wherein said metal plate is analuminum alloy plate, and said lubricating resin coating film having athickness of 5 to 100 μm is formed on at least one side face thereof.23. A metal plate coated with a lubricating resin according to claim 21,wherein the thickness of said aluminum alloy plate is 20 to 400 μm. 24.A metal plate coated with a lubricating resin according to claim 22,wherein the thickness of said aluminum alloy plate is 20 to 400 μm. 25.A metal plate coated with a lubricating resin according to claim 1,wherein it is used as a patch board for protection arranged at theproceeding side of a drill of a plurality of printed wiring boardslaminated when the drilling processing of small diameter is carried out.26. A metal plate coated with a lubricating resin according to claim 9,wherein it is used as a patch board for protection arranged at theproceeding side of a drill of a plurality of printed wiring boardslaminated when the drilling processing of small diameter is carried out.27. A drilling processing method of a printed wiring board comprisingthe steps of: arranging the metal plate coated with a lubricating resinaccording to any one of claims 1 to 19 on a face of one or a pluralityof printed wiring boards piled to which a drill proceeds, as a patchboard for protection; and carrying out drilling by a drill.